txe_bpc.c

threadx嵌入式实时操作系统源代码

/**************************************************************************/ 
/*                                                                        */ 
/*            Copyright (c) 1996-2000 by Express Logic Inc.               */ 
/*                                                                        */ 
/*  This software is copyrighted by and is the sole property of Express   */ 
/*  Logic, Inc.  All rights, title, ownership, or other interests         */ 
/*  in the software remain the property of Express Logic, Inc.  This      */ 
/*  software may only be used in accordance with the corresponding        */ 
/*  license agreement.  Any unauthorized use, duplication, transmission,  */ 
/*  distribution, or disclosure of this software is expressly forbidden.  */ 
/*                                                                        */
/*  This Copyright notice may not be removed or modified without prior    */ 
/*  written consent of Express Logic, Inc.                                */ 
/*                                                                        */ 
/*  Express Logic, Inc. reserves the right to modify this software        */ 
/*  without notice.                                                       */ 
/*                                                                        */ 
/*  Express Logic, Inc.                                                   */
/*  11440 West Bernardo Court               [e-mail]         */
/*  Suite 366                               http://www.expresslogic.com   */
/*  San Diego, CA  92127                                                  */
/*                                                                        */
/**************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */ 
/** ThreadX Component                                                     */ 
/**                                                                       */
/**   Block Pool (BLO)                                                    */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

#define TX_SOURCE_CODE


/* Include necessary system files.  */

#include    "tx_api.h"
#include    "tx_ini.h"
#include    "tx_thr.h"
#include    "tx_tim.h"
#include    "tx_blo.h"


/**************************************************************************/ 
/*                                                                        */ 
/*  FUNCTION                                               RELEASE        */ 
/*                                                                        */ 
/*    _txe_block_pool_create                              PORTABLE C      */ 
/*                                                           3.0f         */ 
/*  AUTHOR                                                                */ 
/*                                                                        */ 
/*    William E. Lamie, Express Logic, Inc.                               */ 
/*                                                                        */ 
/*  DESCRIPTION                                                           */ 
/*                                                                        */ 
/*    This function checks for errors in the create block memory pool     */ 
/*    function call.                                                      */ 
/*                                                                        */ 
/*  INPUT                                                                 */ 
/*                                                                        */ 
/*    pool_ptr                          Pointer to pool control block     */ 
/*    name_ptr                          Pointer to block pool name        */ 
/*    block_size                        Number of bytes in each block     */ 
/*    pool_start                        Address of beginning of pool area */ 
/*    pool_size                         Number of bytes in the block pool */ 
/*                                                                        */ 
/*  OUTPUT                                                                */ 
/*                                                                        */ 
/*    TX_POOL_ERROR                     Invalid pool pointer              */ 
/*    TX_PTR_ERROR                      Invalid starting address          */ 
/*    TX_SIZE_ERROR                     Invalid pool size                 */ 
/*    TX_CALLER_ERROR                   Invalid caller of pool            */ 
/*    status                            Actual completion status          */ 
/*                                                                        */ 
/*  CALLS                                                                 */ 
/*                                                                        */ 
/*    _tx_block_pool_create             Actual block pool create function */ 
/*                                                                        */ 
/*  CALLED BY                                                             */ 
/*                                                                        */ 
/*    Application Code                                                    */ 
/*                                                                        */ 
/*  RELEASE HISTORY                                                       */ 
/*                                                                        */ 
/*    DATE              NAME                      DESCRIPTION             */ 
/*                                                                        */ 
/*  12-31-1996     William E. Lamie         Initial Version 3.0           */ 
/*  11-11-1997     William E. Lamie         Modified comment(s),          */ 
/*                                            resulting in version 3.0b.  */ 
/*  01-01-1999     William E. Lamie         Modified comment(s),          */ 
/*                                            resulting in version 3.0e.  */ 
/*  11-01-1999     William E. Lamie         Modified comment(s),          */ 
/*                                            resulting in version 3.0f.  */ 
/*                                                                        */ 
/**************************************************************************/ 
UINT    _txe_block_pool_create(TX_BLOCK_POOL *pool_ptr, CHAR *name_ptr, ULONG block_size,
                    VOID *pool_start, ULONG pool_size)
{

REG_1   UINT        status;                 /* Return status           */

    /* First, check for an invalid pool pointer.  */
    if ((!pool_ptr) || (pool_ptr -> tx_block_pool_id == TX_BLOCK_POOL_ID))
    
        /* Pool pointer is invalid, return appropriate error code.  */
        return(TX_POOL_ERROR);

    /* Check for an invalid starting address.  */
    if (!pool_start)

        /* Null starting address pointer, return appropriate error.  */
        return(TX_PTR_ERROR);

    /* Check for invalid pool size.  */
    if ((((block_size/sizeof(void *))*sizeof(void *)) + sizeof(void *)) > 
                                            ((pool_size/sizeof(void *))*sizeof(void *)))

        /* Not enough room for one block, return appropriate error.  */
        return(TX_SIZE_ERROR);

    /* Check for invalid caller of this function.  */
    if (((!_tx_thread_current_ptr) && (_tx_thread_system_state != TX_INITIALIZE_IN_PROGRESS)) ||
        ((_tx_thread_current_ptr) && (_tx_thread_system_state)) ||
        (_tx_thread_current_ptr == &_tx_timer_thread))

        /* Invalid caller of this function, return appropriate error code.  */
        return(TX_CALLER_ERROR);

    /* Call actual block pool create function.  */
    status =  _tx_block_pool_create(pool_ptr, name_ptr, block_size, pool_start, pool_size);

    /* Return actual completion status.  */
    return(status);
}